Adamf , Please excuse me if I ask strange questions, as I don’t quite understand your request.
If you are using a client, like Outlook, etc. then the reception of this “Move E-Mail” works? If yes, then your concern is answered with this solution.
If you are using your own server to pick up the mails on your mailserver, I can’t give you any more tips, because we don’t have our own mailserver here as a test.
Maybe our abuse team can help you? (abuse@upc.ch)
Greetings
Daniele